test

#include<stdio.h>
int main()
{
    int i,j,f=1;
    char s[110];
    scanf("%[^\n]s",s);
    if(s[0]=='i'&&s[1]=='f'){
            if(s[2]=='('){
                if(isalpha(s[3])){
                    if(s[4]=='<'||s[4]=='>'||s[4]=='='){
                        if(!isdigit(s[5])&&s[5]=='='){
                            if(isdigit(s[6])){
                                i=6;
                                while(isdigit(s[i])){
                                    i++;
                                }
                                if(s[i]==')'&&!s[i+1]){
                                    printf("if = identifier\n");
                                    printf("() = parenthesis\n");
                                    printf("%c%c = operator\n",s[4],s[5]);
                                    printf("%c = variable\n",s[3]);
                                    for(j=6;j<i;j++)printf("%c",s[j]);
                                    printf(" = integer\n");
                                }
                                else f=0;
                            }
                            else f=0;
                        }
                        else if(isdigit(s[5])){
                            i=5;
                            while(isdigit(s[i])){
                                i++;
                            }
                            if(s[i]==')'&&!s[i+1]){
                                printf("if = identifier\n");
                                printf("() = parenthesis\n");
                                printf("%c = operator\n",s[4]);
                                printf("%c = variable\n",s[3]);
                                for(j=5;j<i;j++)printf("%c",s[j]);
                                printf(" = integer\n");
                            }
                        }
                        else f=0;
                    }
                    else f=0;
                }
                else f=0;
            }
            else f=0;
    }
    else if(s[0]=='e'&&s[1]=='l'&&s[2]=='s'&&s[3]=='e'&&s[4]==' '&&s[5]=='i'&&s[6]=='f'){
        if(s[7]=='('){
            if(isalpha(s[8])){
                    if(s[9]=='<'||s[9]=='>'||s[9]=='='){
                        if(!isdigit(s[10])&&s[10]=='='){
                            if(isdigit(s[11])){
                                i=11;
                                while(isdigit(s[i])){
                                    i++;
                                }
                                if(s[i]==')'&&!s[i+1]){
                                    printf("else if = identifier\n");
                                    printf("() = parenthesis\n");
                                    printf("%c%c = operator\n",s[9],s[10]);
                                    printf("%c = variable\n",s[8]);
                                    for(j=11;j<i;j++)printf("%c",s[j]);
                                    printf(" = integer\n");
                                }
                                else f=0;
                            }
                            else f=0;
                        }
                        else if(isdigit(s[10])){
                            i=10;
                            while(isdigit(s[i])){
                                i++;
                            }
                            if(s[i]==')'&&!s[i+1]){
                                printf("else if = identifier\n");
                                printf("() = parenthesis\n");
                                printf("%c = operator\n",s[9]);
                                printf("%c = variable\n",s[8]);
                                for(j=10;j<i;j++)printf("%c",s[j]);
                                printf(" = integer\n");
                            }
                        }
                        else f=0;
                    }
                    else f=0;
                }
                else f=0;
            }
            else f=0;
        }
    else if(isalpha(s[0])){
        if(s[1]=='='){
            if(isalpha(s[2])){
                if(s[3]=='+'||s[3]=='-'){
                    if(isdigit(s[4])){
                    i=4;
                    while(isdigit(s[i])){
                        i++;
                    }
                    if(s[i]==';'&&!s[i+1]){
                        printf("%c = variable\n",s[0]);
                        printf("= = operator\n",s[1]);
                        printf("%c = operator\n",s[3]);
                        printf("%c = variable\n",s[2]);
                        for(j=4;j<i;j++)printf("%c",s[j]);
                        printf(" = integer\n");
                        printf("; = end\n");
                    }
                    else f=0;
                }
                else if(isalpha(s[4])){
                    if(s[5]==';'&&!s[6]){
                        printf("%c = variable\n",s[0]);
                        printf("= = operator\n",s[1]);
                        printf("%c = operator\n",s[3]);
                        printf("%c = variable\n",s[2]);
                        printf("%c = variable\n",s[4]);
                        printf("; = end\n");
                    }
                    else f=0;
                }
                else f=0;
                }
            }
        }
        else f=0;
    }
    if(f==0)printf("invalid\n");
    return 0;
}